#!/usr/bin/env bash
# Build the runtime dependencies OSRM needs, from source, no sudo, no
# conan: bzip2, lua 5.2 (static), oneTBB, boost (b2, with hand-rolled
# CMake config files — boost release tarballs ship no CMake support).
#
# Artifacts: $W (default /tmp/osm-build), installed into $W/prefix.
# Idempotent: each dep is skipped when its .done-<name> marker exists.
set -uo pipefail
W="${W:-/tmp/osm-build}"
P="$W/prefix"
mkdir -p "$P/include" "$P/lib" "$W"
log() { echo "[$(date +%T)] $*"; }

fetch() { [ -s "$2" ] || curl -sL --retry 3 -o "$2" "$1"; }

build_dep() { # name, then command...
  local name=$1; shift
  [ -f "$W/.done-$name" ] && { log "$name: already done"; return; }
  log "$name: building"
  if "$@" > "$W/$name.log" 2>&1; then
    touch "$W/.done-$name"
  else
    log "$name: FAILED (see $W/$name.log)"; exit 1
  fi
}

# --- sources ---
fetch "https://sourceware.org/pub/bzip2/bzip2-1.0.8.tar.gz" "$W/bzip2.tgz"
[ -d "$W/bzip2-1.0.8" ] || tar -C "$W" -xzf "$W/bzip2.tgz"
fetch "https://www.lua.org/ftp/lua-5.2.4.tar.gz" "$W/lua.tgz"
[ -d "$W/lua-5.2.4" ] || tar -C "$W" -xzf "$W/lua.tgz"
fetch "https://github.com/oneapi-src/oneTBB/archive/refs/tags/v2021.13.0.tar.gz" "$W/tbb.tgz"
[ -d "$W/oneTBB-2021.13.0" ] || tar -C "$W" -xzf "$W/tbb.tgz"
fetch "https://archives.boost.io/release/1.84.0/source/boost_1_84_0.tar.gz" "$W/boost.tgz"
[ -d "$W/boost_1_84_0" ] || tar -C "$W" -xzf "$W/boost.tgz"

# --- bzip2 ---
build_dep bzip2 bash -c "
  cd $W/bzip2-1.0.8 && make -s -j16 CFLAGS='-O2 -fPIC'
  cp bzlib.h $P/include/ && cp libbz2.a $P/lib/"

# --- lua 5.2 (library only; the interactive REPL needs readline dev
#     headers, which we stub — we only link liblua.a into osrm-extract) ---
build_dep lua bash -c "
  mkdir -p $W/local/include/readline $W/local/lib
  cat > $W/local/include/readline/readline.h <<'HDR'
#ifndef READLINE_STUB_H
#define READLINE_STUB_H
char *readline(const char *prompt);
void add_history(const char *line);
#endif
HDR
  cat > $W/local/include/readline/history.h <<'HDR'
#ifndef HISTORY_STUB_H
#define HISTORY_STUB_H
void using_history(void);
void clear_history(void);
#endif
HDR
  ln -sf /usr/lib/x86_64-linux-gnu/libreadline.so.8 $W/local/lib/libreadline.so
  cd $W/lua-5.2.4/src && make -s clean >/dev/null 2>&1
  make -s -j16 linux MYCFLAGS='-I$W/local/include' MYLDFLAGS='-L$W/local/lib'
  cp lua.h luaconf.h lualib.h lauxlib.h lua.hpp $P/include/
  cp liblua.a $P/lib/"

# --- nlohmann/json (single header; needed by osmium-tool) ---
if [ ! -f "$P/include/nlohmann/json.hpp" ]; then
  log "nlohmann-json: fetching single header"
  mkdir -p "$P/include/nlohmann"
  curl -sL -o "$P/include/nlohmann/json.hpp" \
    https://github.com/nlohmann/json/releases/download/v3.11.3/json.hpp
fi

# --- oneTBB (CMake, installs TBBConfig.cmake) ---
build_dep tbb bash -c "
  cmake -S $W/oneTBB-2021.13.0 -B $W/tbb-build -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_INSTALL_PREFIX=$P -DTBB_TEST=OFF -DTBB_STRICT=OFF
  cmake --build $W/tbb-build -j16
  cmake --install $W/tbb-build"

# --- boost: b2 for the libs, then headers + CMake config files ---
build_dep boost bash -c "
  cd $W/boost_1_84_0
  [ -x ./b2 ] || ./bootstrap.sh
  ./b2 -j16 --with-date_time --with-iostreams --with-program_options \
       --with-thread --with-test --with-regex \
       --layout=versioned link=static cxxstd=17
  rm -rf $P/include/boost && cp -r $W/boost_1_84_0/boost $P/include/boost
  cp -a $W/boost_1_84_0/stage/lib/libboost_*.a $P/lib/
  W=$W bash $(dirname "$0")/install-boost-cmake.sh"

# --- osmium-tool (PBF merging; uses OSRM's vendored libosmium/protozero) ---
build_dep osmium bash -c "
  if [ ! -d $W/osrm-backend-26.4.1 ]; then
    fetch "https://github.com/Project-OSRM/osrm-backend/archive/refs/tags/v26.4.1.tar.gz" $W/osrm.tar.gz
    tar -C $W -xzf $W/osrm.tar.gz
  fi
  if [ ! -d $W/osmium-tool-1.19.0 ]; then
    fetch "https://github.com/osmcode/osmium-tool/archive/refs/tags/v1.19.0.tar.gz" $W/osmium.tgz
    tar -C $W -xzf $W/osmium.tgz
  fi
  rm -rf $W/osmium-build
  cmake -S $W/osmium-tool-1.19.0 -B $W/osmium-build -DCMAKE_BUILD_TYPE=Release \
    -DOSMIUM_BUILD_PROGRAMS=ON -DOSMIUM_BUILD_TESTS=OFF \
    -DCMAKE_PREFIX_PATH=$P \
    -DOSMIUM_INCLUDE_DIR=$W/osrm-backend-26.4.1/third_party/libosmium/include \
    -DPROTOZERO_INCLUDE_DIR=$W/osrm-backend-26.4.1/third_party/protozero/include
  cmake --build $W/osmium-build --target osmium -j16"

log "ALL DEPS DONE"